Revision C • 10/07
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2-13
2 Installation
Connecting an S/PDIF Device to
an RMX
digital AES/EBU Input
249 ohm resistor
From
S/PDIF
Device
Console
AES/EBU
Input
Signal
Shield
3
2
1
S/PDIF Signals
Digital devices with only an S/PDIF digital out-
put can connect to an RMX
digital input, but only
if a 249 ohm resistor is used to impedance match
the S/PDIF cable. Install the resistor in the AMP
MOD IV housing per the following illustration.
An unbalanced-to-balanced line transformer can
alternately be used to interface an S/PDIF signal.
Note 1:
A signal conversion interface must be
used to connect an AES/EBU output to a S/PDIF
input.
Note 2:
Some S/PDIF signals may not work with
the RMX
digital’s inputs, even with the additional
load resistor or a transformer, because of nonstand-
ard levels or protocols in the S/PDIF product.
RMXDIGITAL SAMPLE RATE
The RMX
digital uses the professional audio
sample rate of 48 kHz for all its internal audio
mixing and routing. Each digital input has an in-
tegral sample rate converter to convert sample
rates from 25 to 50 kHz to the console’s internal
48 kHz sample rate.
The console’s digital outputs are fixed at 48 kHz,
except for PGM 1, PGM 2, Send, and KSU Out-
puts A and B. Each can be set for 44.1 kHz in the
init.mac
file (see Chapter 4 for how to change
the sample rates on these outputs).
When the console is used in a stand-alone ap-
plication, the console cannot be locked to an ex-
ternal time reference. To accomplish this, the RMX-
digital must be networked in a VistaMax system
Connecting an Unbalanced Stereo Device
to an RMX
digital Analog Input
Console
Balanced
Input
From the
Unbalanced
Device
R
L
Shields
3 6
2 5
1 4
UNBALANCED CONNECTIONS
Although all analog inputs and outputs are
active and balanced, unbalanced consumer or
“semipro” equipment can be connected to the con-
sole. For best results, connect an unbalanced de-
vice through an IHF-PRO match box and keep
the unbalanced cable lengths as short as possible.
If a match box is not available, connect an un-
balanced device directly to a RMX
digital input
using the following illustration.
When an unbalanced device must be connected
to an RMX
digital balanced analog output, and
an IHF-PRO match box is not available, do not
tie the low (-) and shield pins together to “unbal-
ance” the signal. The low output pin must always
be left floating when unbalancing an RMX
digital
output, as shown in the following illustration.
AES/EBU Digital Inputs & Outputs
Pin Signal Description
1
Shield (connects directly to the chassis)
2
Low (-)
3
High (+)
Console
Balanced
Output
To the
Unbalanced
Device
R
L
Shields
Connecting an Unbalanced Device
to an RMX
digital Analog Output
(Nominal Output is -2 dBu)
(Make no connections to pins 2 & 5)
3 6
2 5
1 4
Summary of Contents for RMXDIGITAL
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